An underlying slopper is the act of a girl smearing her boyfriend's diarrhea on his balls and then using said diarrhea as lube to give him a handjob.
by MonsterLog42 December 10, 2022
Get the underlying slopper mug.Carl: "Yo Stewie, how was your date with Andessa?"
Stewie: "You wont believe me, she gave me the best Underline Slopper ever"
Stewie: "You wont believe me, she gave me the best Underline Slopper ever"
by Seacole June 22, 2023
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